iptables-1.3.2-20050720

[iptables.git] / extensions / libipt_set.c

diff --git a/extensions/libipt_set.c b/extensions/libipt_set.c
new file mode 100644 (file)
index 0000000..e485f05
--- /dev/null
+++ b/extensions/libipt_set.c
@@ -0,0 +1,167 @@
+/* Copyright (C) 2000-2002 Joakim Axelsson <gozem@linux.nu>
+ *                         Patrick Schaaf <bof@bof.de>
+ *                         Martin Josefsson <gandalf@wlug.westbo.se>
+ * Copyright (C) 2003-2004 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.  
+ */
+
+/* Shared library add-on to iptables to add IP set matching. */
+#include <stdio.h>
+#include <netdb.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <ctype.h>
+#include <errno.h>
+
+#include <iptables.h>
+#include <linux/netfilter_ipv4/ip_conntrack.h>
+#include <linux/netfilter_ipv4/ipt_set.h>
+#include "libipt_set.h"
+
+/* Function which prints out usage message. */
+static void help(void)
+{
+       printf("set v%s options:\n"
+              " [!] --set     name flags\n"
+              "                'name' is the set name from to match,\n" 
+              "                'flags' are the comma separated list of\n"
+              "                'src' and 'dst'.\n"
+              "\n", IPTABLES_VERSION);
+}
+
+static struct option opts[] = {
+       {"set", 1, 0, '1'},
+       {0}
+};
+
+/* Initialize the match. */
+static void init(struct ipt_entry_match *match, unsigned int *nfcache)
+{
+       struct ipt_set_info_match *info = 
+               (struct ipt_set_info_match *) match->data;
+       
+
+       memset(info, 0, sizeof(struct ipt_set_info_match));
+
+}
+
+/* Function which parses command options; returns true if it ate an option */
+static int
+parse(int c, char **argv, int invert, unsigned int *flags,
+      const struct ipt_entry *entry,
+      unsigned int *nfcache, struct ipt_entry_match **match)
+{
+       struct ipt_set_info_match *myinfo = 
+               (struct ipt_set_info_match *) (*match)->data;
+       struct ipt_set_info *info = &myinfo->match_set;
+
+       switch (c) {
+       case '1':               /* --set <set> <flag>[,<flag> */
+               if (info->flags[0])
+                       exit_error(PARAMETER_PROBLEM,
+                                  "--set can be specified only once");
+
+               check_inverse(optarg, &invert, &optind, 0);
+               if (invert)
+                       info->flags[0] |= IPSET_MATCH_INV;
+
+               if (!argv[optind]
+                   || argv[optind][0] == '-'
+                   || argv[optind][0] == '!')
+                       exit_error(PARAMETER_PROBLEM,
+                                  "--set requires two args.");
+
+               if (strlen(argv[optind-1]) > IP_SET_MAXNAMELEN - 1)
+                       exit_error(PARAMETER_PROBLEM,
+                                  "setname `%s' too long, max %d characters.",
+                                  argv[optind-1], IP_SET_MAXNAMELEN - 1);
+
+               get_set_byname(argv[optind - 1], info);
+               parse_bindings(argv[optind], info);
+               DEBUGP("parse: set index %u\n", info->index);
+               optind++;
+               
+               *flags = 1;
+               break;
+
+       default:
+               return 0;
+       }
+
+       return 1;
+}
+
+/* Final check; must have specified --set. */
+static void final_check(unsigned int flags)
+{
+       if (!flags)
+               exit_error(PARAMETER_PROBLEM,
+                          "You must specify `--set' with proper arguments");
+       DEBUGP("final check OK\n");
+}
+
+static void
+print_match(const char *prefix, const struct ipt_set_info *info)
+{
+       int i;
+       char setname[IP_SET_MAXNAMELEN];
+
+       get_set_byid(setname, info->index);
+       printf("%s%s %s", 
+              (info->flags[0] & IPSET_MATCH_INV) ? "!" : "",
+              prefix,
+              setname); 
+       for (i = 0; i < IP_SET_MAX_BINDINGS; i++) {
+               if (!info->flags[i])
+                       break;          
+               printf("%s%s",
+                      i == 0 ? " " : ",",
+                      info->flags[i] & IPSET_SRC ? "src" : "dst");
+       }
+       printf(" ");
+}
+
+/* Prints out the matchinfo. */
+static void
+print(const struct ipt_ip *ip,
+      const struct ipt_entry_match *match, int numeric)
+{
+       struct ipt_set_info_match *info = 
+               (struct ipt_set_info_match *) match->data;
+
+       print_match("set", &info->match_set);
+}
+
+/* Saves the matchinfo in parsable form to stdout. */
+static void save(const struct ipt_ip *ip,
+                const struct ipt_entry_match *match)
+{
+       struct ipt_set_info_match *info = 
+               (struct ipt_set_info_match *) match->data;
+
+       print_match("--set", &info->match_set);
+}
+
+static
+struct iptables_match set = {
+       .name           = "set",
+       .version        = IPTABLES_VERSION,
+       .size           = IPT_ALIGN(sizeof(struct ipt_set_info_match)),
+       .userspacesize  = IPT_ALIGN(sizeof(struct ipt_set_info_match)),
+       .help           = &help,
+       .init           = &init,
+       .parse          = &parse,
+       .final_check    = &final_check,
+       .print          = &print,
+       .save           = &save,
+       .extra_opts     = opts
+};
+
+void _init(void)
+{
+       register_match(&set);
+}